WO1998037950A1 - Portable reverse osmosis unit for producing drinking water - Google Patents
Portable reverse osmosis unit for producing drinking water Download PDFInfo
- Publication number
- WO1998037950A1 WO1998037950A1 PCT/CA1998/000130 CA9800130W WO9837950A1 WO 1998037950 A1 WO1998037950 A1 WO 1998037950A1 CA 9800130 W CA9800130 W CA 9800130W WO 9837950 A1 WO9837950 A1 WO 9837950A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- water
- pressure side
- reverse osmosis
- tank
- retentate
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/04—Feed pretreatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/147—Microfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/04—Specific process operations in the feed stream; Feed pretreatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/20—By influencing the flow
- B01D2321/2066—Pulsated flow
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Definitions
- This invention relates to a method and apparatus for producing drinking water from impure water and more particularly, it relates to a portable apparatus and method for producing drinking water from impure water using microfiltration and reverse osmosis.
- U.S. Patent 5,059,317 discloses an installation for filtering drinking water out of contaminated water, which can be used in many different situations. It consists of a hydrocyclone, a micro filter unit, a unit for reverse osmosis, a mixed bed ion exchange, a re-salting unit, a unit for oxonization, an activated carbon filter and a unit for chlorinization.
- U.S. Patent 5,244,579 discloses a self-contained, transportable reverse osmosis water purification unit which has a limited throughput of no more than about 20 gpm of permeate in a single pass operation with reverse osmosis ("RO") modules which can be cleaned in place.
- RO reverse osmosis
- the unit When raw water is particularly fouled, the unit is operated in a double pass operation in which the permeate from the first pass is used as feed for a second RO module.
- a high pressure pump is required to feed water freed from suspended solids to the RO modules.
- the pump also delivers concentrate to a bladder tank where the concentrate is stored under pressure (about 100 psig) to flush a coarse filter automatically when it is plugged. Fine filters for solids removal can be replaced when the unit is not producing permeate.
- U.S. Patent 3,992,301 discloses an automatic flushing and cleaning system for membrane separation machines such as reverse osmosis machines having plural modules or membranes. Cleaning may be by way of reducing the pressure to allow the membrane to relax, by the injection of air or inert gas to provide turbulence, and/or by injection of flushing liquid which may include chemical cleaning additives. Pumps, automatic valving, and pressure controls are provided, along with a complete timer operated electrical sequencing system whereby desired purging, flushing and cleaning cycles are automatically undertaken at periodic intervals or in response to one or more preferred conditions.
- U.S. Patent 4,842,724 discloses self-standing apparatus for filtering supply water to provide purified water which includes a base subassembly and two container subassemblies.
- One container subassembly provides supply water to filtering apparatus located in the base subassembly.
- the second container holds purified water which passes through a semipermeable membrane filter in the base subassembly. Concentrate from the membrane filter flows back to the supply water container for ultimate recirculation.
- the base subassembly and the container subassemblies have automatically closing valves which render each container watertight when separated from the base subassembly, and which open to provide communication between the containers and filtering apparatus within the base subassembly.
- U.S. Patent 4,670,144 discloses a portable water purification system including a generally rectangular boxlike chest containing a particulate matter prefilter, a reverse osmosis filter and an activated carbon postfilter unit disposed in a lower base part of the chest.
- the prefilter, reverse osmosis filter and post-filter units are connected in series by flexible conduits.
- U.S. Patent 5,004,535 discloses a reverse osmosis water purification system including a support structure dimensioned and arranged to facilitate manual transportation, purification components mounted on the support structure for producing product water and waste water from feedwater by reverse osmosis, the pump components mounted on the support structure for pumping feedwater from a separate source to the purification means.
- U.S. Patent 5,589,066 discloses a portable water purification system which has a prefilter, a pumping unit, a reverse osmosis unit, a microbial control unit and a post filter for removing nuclear, biological, chemical and other contaminants from a water source.
- the hand operated pumping unit has a feed water cylinder and a concentrate cylinder to control ratios between intake and concentrate volumes. The system further prolongs the life of components by reducing the level of contaminants in contact with parts of the system.
- Other patents disclosing water purification systems include U.S.
- a portable water purification unit which can economically and efficiently produce potable water from impure or contaminated water.
- a method of purifying impure water to provide drinking water using a portable apparatus comprising the steps of providing a microfiltration unit for connecting to an impure water source and to an air source, the microfiltration unit comprised of: (i) a tank for containing impure water; (ii) a microfiltration module positioned in the tank to filter the impure water to provide a concentrate, the microfiltration module comprised of an array of hydrophilic hollow tubular membranes having an inside surface and an outside surface, the membranes having a pore size in the range of about 0.05 to 1.2 ⁇ m; and (iii) an air diffuser located in the tank for diffusing air past the tubular membranes for inducing water movement around the tubular membranes.
- Water is pumped from the impure water source into the tank and water is drawn through the tubular membranes to provide purified water and simultaneously therewith impurities are rejected to provide concentrate. Excess concentrate is permitted to overflow from the tank back to the impure water source.
- Purified water from the microfiltration unit is directed to a high pressure side of a reverse osmosis module wherein water permeate is passed through a membrane to a low pressure side of the reverse osmosis module to provide drinking water and impurities are concentrated in the high pressure side to provide a retentate. Retentate is recirculated to a CIP (clean-in-place) container.
- CIP clean-in-place
- the hollow tubular membranes are backflushed with the retentate from the CIP container by directing the retentate to the inside surfaces of the membranes and by passing the retentate through the membranes thereby dislodging particles from the outside surfaces.
- retentate from the CIP container is directed to the high pressure side of the reverse osmosis module thereby continuing production of drinking water during the backflushing.
- the sole figure is a schematic representation showing the flow of water through the apparatus in accordance with the invention.
- the impure water source can include diverse water sources, including sea water, surface water and brackish water or other sources of water, and the apparatus can be used during nuclear, chemical and biological warfare.
- the apparatus is designed for removing contaminants including bacteria, suspended and dissolved solids, viruses, parasites and nuclear, chemical and biological warfare contaminants.
- the portable apparatus permits improved productivity of drinking water and minimum use of chemicals for cleaning.
- the main steps of the system or process include pumping of impure or raw water, microfiltration, booster pumping, reverse osmosis and disinfecting the product or drinking water. If necessary, the apparatus can be disassembled into five units and can be operated with a portable power unit.
- the raw or impure water pumping system is referred to generally as 2.
- a pump 4 connected to a filter 6 located in water 8 for purposes of illustration.
- Pump 4 is connected to filter 6 by means of a hose 10 using quick disconnect members.
- Filter or strainer 6 is used to filter out larger debris including stones, leaves and moss and has about a 500 micron size inlet openings.
- Pump 4 directs strained water through pipe or hose 11 to tank 14.
- Pipe 11 can be a flexible hose using quick disconnect features.
- Microfiltration unit comprises a tank 14 having an inlet 15 for receiving the impure water from pump 4.
- tank 14 is filled with water and excess water is removed or discharged therefrom using exit 16 which discharges water along line 18 typically back into the source of impure or contaminated water.
- Line 18 may be a flexible hose which is easily connected or disconnected to tank 14.
- Tank 14 contains a microfilter 20.
- microfilter 20 is comprised of two modules or arrays of hydrophilic hollow tubular membranes illustrated by lines 22 which are potted in or are connected to headers 24.
- lines 22 which are potted in or are connected to headers 24.
- water subjected to microfiltration permeates the walls of hollow tubular membranes 22 and is collected in headers 24 and removed along lines 26.
- the tubular hollow membranes 22 have a nominal pore size of 0.2 ⁇ m and are available from Zenon Environmental, Inc. under the trademark Zee Weed.
- the tubular hollow membrane is operated to remove suspended solids, microorganisms and algae to provide purified water and a concentrate which is flushed out of tank 14 along line 18 and discharged.
- air is pumped into tank 14 from pump 30 along line 32 to distributor or diffuser 34.
- the air may be filtered at 29 prior to entering blower 30.
- Air from diffuser 34 operates to induce movement to water contacting or surrounding the outside of tubular membranes 22 to effect cleaning of the membranes.
- movement may be induced to the membrane. That is, percolation of the air can cause the tubular membrane to sway or move in the water, thereby effectively cleaning the membrane.
- any type of diffuser may be utilized to provide movement of water in tank 14 such as an impeller, for example.
- a preferred module employing hollow fiber membranes suitable for use in the present invention is disclosed in U.S.
- Exemplary of a substantially vertical membrane is shown in Figure 3 of U.S. Patent 5,639,373.
- the membrane of Figure 3 may be deployed in a horizontal plane for convenience.
- the vertical or horizontal skein is located in the water to present a generally vertical or horizontal profile, but has no structural shape. Such shape changes continuously, the degree of change depending upon the flexibility of the fibers, their lengths, the overall dimensions of the skein, and the degree of movement imparted to the fibers by the water and also by the air from the gas- distribution means.
- U.S. Patents 5,248,424 and 5,639,373 depict configurations of membranes which can be used, and other configurations are contemplated within the purview of the invention.
- the skeins of fibers are shown vertical as noted, it will be appreciated that the skeins may be disposed at any angle between horizontal and vertical, as desired.
- U.S. Patent 5,248,424 is comprised of an array of hollow fibers. That is, the membrane is comprised of a frameless array of unconfined hollow fibers which provide an effective membrane device for withdrawing permeate from raw water, the flux through the membranes reaching an essentially constant relatively high value because of the deployment of fibers of the array as a skein, arching in a buoyantly swayable generally parabolic configuration.
- the array extends above at least one of the array's headers in which the terminal end portions of the fibers are potted.
- each hollow fiber is normally greater than the direct center-to-center distance between the array's pair of headers.
- an assembly of the array and a gas distributor means has fibers preferable >0.5 meter long, which together provide a surface area >10 m 2 .
- the terminal end portions of fibers in each header are substantially free from fiber-to-fiber contact.
- the permeate may be withdrawn under a vacuum induced by gravity.
- a pump is used which provides a suction less than 75 cm of Hg.
- the hollow fibers used to form the skein of an array may be formed of any membrane material provided the fibers are flexible.
- Preferred fibers operate with a transmembrane pressure differential in the range from about 3.5 kPa (0.5 psi) to about 175 kPa (25 psi).
- Most preferred are hollow fibers which provide transmembrane pressure differential in the range from 7 kPa (1 psi) to 69 kPa(10 psi).
- Preferred hollow fibers are made of organic polymers and ceramics, whether isotropic, or anisotropic, with a thin layer or skin on the outside surface of the fibers.
- Some fibers may be made from braided cotton covered with a porous natural rubber latex or a water-insoluble cellulosic polymeric material.
- Preferred organic polymers for fibers are polysulfones, poly(styrenes), including styrene- containing copolymers such as acrylonitrile-styrene, butadiene-styrene and styrenevinylbenzylhalide copolymers, polycarbonates, cellulosic polymers, polypropylene, poly(vinyl chloride), poly(ethylene terephthalate), and the like disclosed in U.S. Patent 4,230,463 the disclosure of which is incorporated by reference thereto as if fully set forth herein.
- Preferred ceramic fibers are made from alumina by E.I. duPont deNemours Co. and disclosed in U.S. Patent 4,069,157, incorporated herein by reference as if set forth.
- the fibers may be deployed in the substrate to form an unsupported arch or loop, the dimensions of the arch or loop being determined by the length of the skein and the spacing of the headers or the fibers may be just slightly longer than the distance between the headers.
- the generally parabolic arch formed is usually symmetrical because the headers are coplanarly disposed within the substrate, the shape of the arch may also be asymmetrical. The arch is asymmetrical when one header is disposed at a lower level, transversely spaced-apart from the other.
- the outside diameter of a fiber is at least 20 ⁇ m and may be as large as about 3 mm, typically being in the range from about 0.1 mm to 2 mm.
- the wall thickness of a fiber is at least 5 ⁇ m and may be as much as 1.2 mm, typically being in the range from about 15% to about 60% of the outside diameter of the fiber, most preferably from 0.5 mm to 1.2 mm.
- the average pore cross-sectional diameter in a fiber may vary widely, being in the range from about 5 to 10,000 A.
- the preferred pore diameter for ultrafiltration of components is a substrate feedstream being in the range from about 5 to 1,000 A; and for microfiltration, in the range from 1,000 to 10,000 A, for example.
- the length of a fiber in a skein is essentially independent of the strength of the fiber, or its diameter, because the skein is buoyed, both by bubbles and the substrate in which it is deployed.
- the length of each fiber in the skein is preferably determined by the conditions under which the array is to operate. Typically, fibers range from 1 m to about 5 m long, depending upon the dimensions of the body of substrate (depth and width) in which the array is deployed.
- the number of fibers in an array is arbitrary, typically being in the range from about 1,000 to about 10,000, and the preferred surface area for a skein is in the range from 10 m 2 to 100 m 2 .
- Air may be provided continuously or intermittently, better results generally being obtained with continuous air flow.
- the amount of air provided depends upon the type of substrate and the susceptibility of the surfaces of the fibers to be plugged. Air may be provided to tank 10 continuously and typically added continuously at a rate of 0.005 to 0.5 ft min/ft 2 of membrane surface. If the air is added intermittently, the same rates can apply and the interval may be 1 to 30 minutes.
- purified water is removed from headers 24 along lines 26 and directed along line 36. Part of line 36 can feature a quick disconnect portion 35. Purified water is directed along line 36 to line 37. Under normal operation, purified water is directed through valve 40 which is open. Also, under " normal operation, both valves 42 and 44 are closed. Thus, under normal operation microfiltration process pump 50 draws purified water along lines 26, 35, 36 and 37 and directs the purified water along line 51 and 52 through microfilter 54 to reverse osmosis process pump 60.
- Line 52 may include a hose 51 having quick-disconnect features.
- Flexible hoses 46 may be provided on either side of pumps 50 and 60. Between pumps 50 and 60, pressure valves may be provided to ensure the pressure required in line 52.
- Pump 60 directs purified water along line 62 to high pressure side 68 of reverse osmosis unit 70. Water permeate is withdrawn through membrane 72 to low pressure side 74 where it is directed along line 76 to a storage tank 80. Line 76 may be provided with a quick disconnect feature 78. Any type of reverse osmosis membrane may be used with a preferred type being spiral wound sea water rejection type membranes.
- impurities are concentrated in high pressure side 68 to provide a retentate.
- the subject invention may be operated with a single reverse osmosis module. However, it is preferred that retentate is directed along 82 to high pressure side 84 of second reverse osmosis unit 86.
- Reverse osmosis unit 86 is provided with a membrane 88 and low pressure side 90. Water permeate is drawn or forced through membrane 88 to provide potable water which is directed along line 92 to line 76 to storage tank 80.
- retentate from reverse osmosis unit 86 is directed along line 94 through valves 96 and 98 to CIP (clean-in-place) tank 100.
- Line 94 may have a quick-disconnect portion 95.
- CIP tank 100 is full, excess retentate is directed along line 102 to line or adapter 16 to line 18 back to the source of water 8.
- CIP tank 100 normally contains retentate. Further, CIP tank 100 is connected by lines 104 to lines 37 and 52 through valve 44 which under normal operating conditions is closed as shown in the figure. Further, valve 42 is normally closed. CIP tank 100 provides a source of water for backflushing tubular membranes 22. That is, it should be understood that microfiltration membranes 22 are flushed with reverse osmosis retentate or concentrate to remove or purge foulants such as solids or particles from the pores or surface. This operation is controlled by a programmable logic controller 110 which is electrically connected to solenoid valve 40 (first valve), 42 (second valve) and 44 (third valve). That is, on backflushing, programmable logic controller 110 opens valves 44 and 42 and closes valve 40.
- pump 50 draws retentate from CIP tank 100 along line 104 through valve 44 (now open) along line 52 and into line 112, including quick-disconnect hose 113.
- the retentate is directed through valve 42 (now open) through lines 36 and 26.
- the retentate enters the inside of tubular membrane 22 and dislodges foulants from the membranes.
- Backflushing may be programmed at any desired interval for any desired period. Typically, backflushing occurs about every 19 minutes. However, backflushing may be programmed to occur earlier or later at least once every two hours, depending on the supply water, and such times are incorporated herein as if specifically set forth.
- the period or duration of backflushing typically is about 20 seconds, however, this period can be shorter or longer, e.g., 5 to 50 seconds.
- a portion of the reverse osmosis retentate or concentrate is pumped along lines 52 and 62 to reverse osmosis module in order that operation of the reverse osmosis unit is not interrupted during backflushing. This greatly facilitates the efficiency of the unit. Stopping flow of liquid to reverse osmosis module means turning off pump 60 and then turning it on again after backflushing. This requires time to ramp the flow down and then up again and in addition, it can increase the wear on the reverse osmosis module.
- shutting down the reverse osmosis system for short intervals during operation is minimized.
- blower 30 and water pump 2 continue to operate. In this mode, particles or foulants dislodged from the membrane are efficiently flushed from tank 14.
- valves 44 and 42 are closed and valve 40 opened and the process is returned to normal operation.
- retentate from reverse osmosis unit 86 can be recycled along line 94 through valve 96 (shown open) into line 93.
- Valve 98 can be closed or throttled and thus water is directed along line 120 to line 52 where pump 60 recirculates the retentate to high pressure side 68.
- valve 96 is used to regulate the pressure in the reverse osmosis membranes during normal operation. Valve 96 is closed when chemically cleaning the reverse osmosis membranes, redirecting fluid flow through lines 122 and 124. This path is particularly useful when chemical cleaning material is introduced to CIP tank 100 for purposes of cleaning reverse osmosis membranes 72 and 88. This avoids passing cleaning solution through valves 96 and 98 which would cause a high pressure drop. It will be appreciated that chemical cleaning of the reverse osmosis membranes is performed at high flow rates and low pressure.
- hose 51 is disconnected at point 200 and connected at point 132.
- Hose 95 is disconnected from point 201 and connected to point 202 to provide line 124.
- Valves 96 and 203 are closed and valves 204 and 205 are opened.
- CIP tank 100 is filled with cleaning solution.
- Pump 50 recirculates the cleaning solution through a closed circuit.
- Filter 54 and pump 60 are by-passed to prevent a drop in pressure and reduced flow velocity. Also, pump 60 is protected from the cleaning solution.
- cleaning solution flows from CIP tank 100 through lines 104, 44, 52, 46, 51, 130, 62, reverse osmosis units 94, 122 and 124 back into CIP tank 100.
- hoses 10, 11, 18, 33, 35, 51, 78, 95, 113 and 124 provide for disconnect features which permit the reverse osmosis unit to be separated from the microfiltration unit or the storage tank. Separating these parts of the apparatus permits ease of handling or carrying of the individual units by personnel. Further, it should be noted that the microfiltration unit can be operated separate from the reverse osmosis unit or vice versa, depending on the quality of the water.
- valve 301 When chemical cleaning of microfiltration membranes 22 is required, valve 301 is closed, logic controller 110 is set at manual, valves 42 and 44 are opened and valve 40 closed. Tank 14 is drained. Cleaning solution is pumped from CIP tank 100 through pump 50 along lines 112, 37, 36, 35 into membranes 22. Valve 302 is used to regulate pressure to membranes 22.
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- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002281889A CA2281889C (en) | 1997-02-25 | 1998-02-23 | Portable reverse osmosis unit for producing drinking water |
EP98903967A EP0966319B1 (en) | 1997-02-25 | 1998-02-23 | Portable reverse osmosis unit for producing drinking water |
PL335404A PL190786B1 (en) | 1997-02-25 | 1998-02-23 | Portable reverse osmosis unit for obtaining drinking water |
DE69829952T DE69829952T2 (en) | 1997-02-25 | 1998-02-23 | PORTABLE REVERSE OSMOSIZE UNIT FOR DRINKING WATER TREATMENT |
AU62024/98A AU743993B2 (en) | 1997-02-25 | 1998-02-23 | Portable reverse osmosis unit for producing drinking water |
HU0000639A HU222408B1 (en) | 1997-02-25 | 1998-02-23 | Method and system and portable unit for water-purification and producing drinking water |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US3851297P | 1997-02-25 | 1997-02-25 | |
US60/038,512 | 1997-02-25 | ||
US09/020,726 | 1998-02-09 | ||
US09/020,726 US6120688A (en) | 1997-02-25 | 1998-02-09 | Portable reverse osmosis unit for producing drinking water |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998037950A1 true WO1998037950A1 (en) | 1998-09-03 |
Family
ID=26693785
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA1998/000130 WO1998037950A1 (en) | 1997-02-25 | 1998-02-23 | Portable reverse osmosis unit for producing drinking water |
Country Status (9)
Country | Link |
---|---|
US (1) | US6120688A (en) |
EP (1) | EP0966319B1 (en) |
AU (1) | AU743993B2 (en) |
CA (1) | CA2281889C (en) |
DE (1) | DE69829952T2 (en) |
HU (1) | HU222408B1 (en) |
PL (1) | PL190786B1 (en) |
TW (1) | TW409070B (en) |
WO (1) | WO1998037950A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10000874A1 (en) * | 2000-01-12 | 2001-07-19 | Klaus Brinkmann | Emergency cross-flow water filter is contained within portable case and electrically powered by solar cells or wind generator |
US6331251B1 (en) | 1999-06-10 | 2001-12-18 | Envirogen, Inc. | System and method for withdrawing permeate through a filter and for cleaning the filter in situ |
EP1323461A2 (en) * | 2001-12-17 | 2003-07-02 | Nitto Denko Corporation | Treatment system having spiral membrane element and method for operating the treatment system |
US6627082B2 (en) | 1999-06-10 | 2003-09-30 | Envirogen, Inc. | System and method for withdrawing permeate through a filter and for cleaning the filter in situ |
WO2010137787A1 (en) | 2009-05-28 | 2010-12-02 | Woongjin Coway Co., Ltd. | Washing device for water treatment apparatus and washing method thereof |
Families Citing this family (87)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AUPM807194A0 (en) * | 1994-09-09 | 1994-10-06 | Ici Australia Operations Proprietary Limited | Water treatment process |
AUPM959994A0 (en) * | 1994-11-22 | 1994-12-15 | Ici Australia Operations Proprietary Limited | Water treatment process |
AU721064B2 (en) | 1996-12-20 | 2000-06-22 | Evoqua Water Technologies Llc | Scouring method |
GB9820935D0 (en) * | 1998-09-25 | 1998-11-18 | Pall Corp | Filtration system |
US6755970B1 (en) | 1999-06-22 | 2004-06-29 | Trisep Corporation | Back-flushable spiral wound filter and methods of making and using same |
US6589426B1 (en) * | 1999-09-29 | 2003-07-08 | Zenon Environmental Inc. | Ultrafiltration and microfiltration module and system |
AU1780402A (en) | 2000-11-10 | 2002-05-21 | Ch2M Hill Inc | Method and apparatus for treatment of drinking water |
US7025884B2 (en) * | 2000-11-10 | 2006-04-11 | Ch2M Hill, Inc. | Method and apparatus for treatment of a fluid system |
NL1017681C2 (en) * | 2001-03-23 | 2002-10-10 | Prime Water Systems Gmbh | Filter system. |
AUPR421501A0 (en) | 2001-04-04 | 2001-05-03 | U.S. Filter Wastewater Group, Inc. | Potting method |
AUPR692401A0 (en) | 2001-08-09 | 2001-08-30 | U.S. Filter Wastewater Group, Inc. | Method of cleaning membrane modules |
AUPR987802A0 (en) | 2002-01-08 | 2002-01-31 | Commonwealth Scientific And Industrial Research Organisation | Complexing resins and method for preparation thereof |
US6758344B2 (en) | 2002-02-21 | 2004-07-06 | Gordon Construction, Inc. | Self-cleaning fluid filter system |
AUPS300602A0 (en) | 2002-06-18 | 2002-07-11 | U.S. Filter Wastewater Group, Inc. | Methods of minimising the effect of integrity loss in hollow fibre membrane modules |
ATE542593T1 (en) | 2002-10-10 | 2012-02-15 | Siemens Industry Inc | MEMBRANE FILTER AND BACKWASHING METHOD THEREOF |
AU2002953111A0 (en) | 2002-12-05 | 2002-12-19 | U. S. Filter Wastewater Group, Inc. | Mixing chamber |
DE602004013731D1 (en) * | 2003-03-05 | 2008-06-26 | Hydranautics | DIPLOCKABLE MEMBRANE MODULE WITH REPLACEABLE MEMBRANE ELEMENTS |
AU2003901583A0 (en) | 2003-04-04 | 2003-05-01 | Orica Australia Pty Ltd | A process |
NZ545206A (en) | 2003-08-29 | 2009-03-31 | Siemens Water Tech Corp | Backwash |
US8114293B2 (en) | 2003-10-29 | 2012-02-14 | Zenon Technology Partnership | Method of operating a water treatment plant with immersed membranes |
US7879229B2 (en) * | 2003-10-29 | 2011-02-01 | Zenon Technology Partnership | Water treatment plant with immersed membranes |
US20050092664A1 (en) * | 2003-11-05 | 2005-05-05 | Ghosh Pushpito K. | Improvised device for concentrating the aqueous solution and a pocess thereof |
WO2005046849A1 (en) | 2003-11-14 | 2005-05-26 | U.S. Filter Wastewater Group, Inc. | Improved module cleaning method |
US8758621B2 (en) * | 2004-03-26 | 2014-06-24 | Evoqua Water Technologies Llc | Process and apparatus for purifying impure water using microfiltration or ultrafiltration in combination with reverse osmosis |
EP2380854A3 (en) | 2004-04-22 | 2012-07-04 | Siemens Industry, Inc. | Filtration apparatus comprising a membrane bioreactor and a treatment vessel for digesting organic materials |
US7291272B2 (en) * | 2004-05-07 | 2007-11-06 | Orica Australia Pty Ltd. | Inorganic contaminant removal from water |
US7763666B2 (en) | 2004-07-28 | 2010-07-27 | Orica Australia Pty Ltd. | Plug-flow regeneration process |
US20060249440A1 (en) * | 2004-07-30 | 2006-11-09 | Adam Kaminski | Collapsible process tank for a water purification system |
NZ588094A (en) | 2004-08-20 | 2012-04-27 | Siemens Water Tech Corp | Potting head for hollow fibre filter module |
AU2005282211B2 (en) | 2004-09-07 | 2011-04-21 | Evoqua Water Technologies Llc | Reduction of backwash liquid waste |
NZ553742A (en) | 2004-09-14 | 2010-09-30 | Siemens Water Tech Corp | Methods and apparatus for removing solids from a membrane module |
EP1807181A4 (en) | 2004-09-15 | 2009-04-22 | Siemens Water Tech Corp | Continuously variable aeration |
US20060129279A1 (en) * | 2004-10-06 | 2006-06-15 | Mcguire Dennis | Mobile emergency filtration system and method |
US7407573B2 (en) * | 2004-12-20 | 2008-08-05 | Chieh-Jung Lai | Quick countercurrent-type water purifier |
CN101623599B (en) | 2004-12-24 | 2013-01-16 | 西门子工业公司 | Cleaning in membrane filtration systems |
NZ555987A (en) | 2004-12-24 | 2009-08-28 | Siemens Water Tech Corp | Simple gas scouring method and apparatus |
US9675938B2 (en) | 2005-04-29 | 2017-06-13 | Evoqua Water Technologies Llc | Chemical clean for membrane filter |
EP1945333B1 (en) | 2005-08-22 | 2011-06-08 | Siemens Industry, Inc. | An assembly for water filtration to minimise backwash volume |
WO2007037985A2 (en) * | 2005-09-23 | 2007-04-05 | Max Rudolf Junghanns | Systems and methods for treating water |
US20070138090A1 (en) | 2005-10-05 | 2007-06-21 | Jordan Edward J | Method and apparatus for treating wastewater |
US20080093277A1 (en) * | 2006-06-13 | 2008-04-24 | John Armour | Cadence detection in a sequence of video fields |
WO2008051546A2 (en) | 2006-10-24 | 2008-05-02 | Siemens Water Technologies Corp. | Infiltration/inflow control for membrane bioreactor |
EP2129629A1 (en) | 2007-04-02 | 2009-12-09 | Siemens Water Technologies Corp. | Improved infiltration/inflow control for membrane bioreactor |
US9764288B2 (en) | 2007-04-04 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane module protection |
ES2384694T3 (en) | 2007-05-29 | 2012-07-11 | Siemens Industry, Inc. | Membrane cleaning with air driven pump |
US20090032446A1 (en) * | 2007-08-01 | 2009-02-05 | Triwatech, L.L.C. | Mobile station and methods for diagnosing and modeling site specific effluent treatment facility requirements |
US8790517B2 (en) | 2007-08-01 | 2014-07-29 | Rockwater Resource, LLC | Mobile station and methods for diagnosing and modeling site specific full-scale effluent treatment facility requirements |
US8187444B2 (en) * | 2007-08-10 | 2012-05-29 | Eric John Kruger | Fluid treatment device |
WO2009101588A2 (en) * | 2008-02-11 | 2009-08-20 | Ecolab Inc. | Use of activator complexes to enhance lower temperature cleaning in alkaline peroxide cleaning systems |
FR2933011B1 (en) * | 2008-06-26 | 2011-11-11 | Degremont | METHOD FOR DISINFECTING A FILTRATION WORKFORCE FOR PRETREATMENT OF SALT WATER, AND INSTALLATION FOR CARRYING OUT SAID METHOD |
WO2010009518A1 (en) | 2008-07-24 | 2010-01-28 | Siemens Water Technologies Corp. | Frame system for membrane filtration modules |
EP2315625B1 (en) | 2008-08-20 | 2018-05-16 | Evoqua Water Technologies LLC | Improved membrane system backwash energy efficiency |
RU2410336C2 (en) * | 2009-02-26 | 2011-01-27 | Общество с ограниченной ответственностью ООО "Аквафор" (ООО "Аквафор") | Apparatus for purifying liquid, method of washing hollow-fibre filter and application of method of washing hollow-fibre filter |
WO2010142673A1 (en) | 2009-06-11 | 2010-12-16 | Siemens Water Technologies Corp. | Methods for cleaning a porous polymeric membrane and a kit for cleaning a porous polymeric membrane |
US20110049049A1 (en) * | 2009-09-03 | 2011-03-03 | General Electric Company | Water purification system skid |
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56111006A (en) * | 1980-02-07 | 1981-09-02 | Ebara Infilco Co Ltd | Method for utilization of back pressure in membrane separating process |
US5059317A (en) * | 1989-10-02 | 1991-10-22 | Dietrich Marius | Transportable apparatus for producing drinking water |
JPH04305287A (en) * | 1991-04-01 | 1992-10-28 | Kubota Corp | Water treating equipment |
JPH05212252A (en) * | 1992-02-04 | 1993-08-24 | Toray Ind Inc | Reverse-osmosis liquid separator |
US5244579A (en) * | 1992-10-09 | 1993-09-14 | Zenon Environmental Inc. | Transportable reverse osmosis water purification unit |
US5248424A (en) * | 1990-08-17 | 1993-09-28 | Zenon Environmental Inc. | Frameless array of hollow fiber membranes and method of maintaining clean fiber surfaces while filtering a substrate to withdraw a permeate |
DE19520913A1 (en) * | 1995-06-08 | 1996-12-12 | Schael Wilfried | Method and device for water treatment according to the principle of reverse osmosis |
JPH09174094A (en) * | 1995-12-26 | 1997-07-08 | Mitsubishi Rayon Eng Co Ltd | Raw water treatment method |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3992301A (en) * | 1973-11-19 | 1976-11-16 | Raypak, Inc. | Automatic flushing system for membrane separation machines such as reverse osmosis machines |
US4574049B1 (en) * | 1984-06-04 | 1999-02-02 | Ionpure Filter Us Inc | Reverse osmosis system |
US4670144A (en) * | 1984-10-23 | 1987-06-02 | Nature's Sunshine Products, Inc. | Portable water purification system |
US4921610A (en) * | 1986-09-04 | 1990-05-01 | Memtec Limited | Cleaning of hollow fibre filters |
US4842724A (en) * | 1988-08-03 | 1989-06-27 | Nimbus Water Systems, Inc. | Water purification apparatus |
US5004535A (en) * | 1989-04-17 | 1991-04-02 | Aquatec Water Systems Incorporated | Water purification system |
KR920008015Y1 (en) * | 1990-06-11 | 1992-10-22 | 삼성전자 주식회사 | Water purifier |
US5639373A (en) * | 1995-08-11 | 1997-06-17 | Zenon Environmental Inc. | Vertical skein of hollow fiber membranes and method of maintaining clean fiber surfaces while filtering a substrate to withdraw a permeate |
US5643455A (en) * | 1991-08-07 | 1997-07-01 | Memtel Limited | Concentration of solids in a suspension using hollow fibre membranes |
US5290442A (en) * | 1991-09-24 | 1994-03-01 | Clack Corporation | Self-contained, purified drinking water refrigerator storage apparatus |
US5282972A (en) * | 1991-12-18 | 1994-02-01 | Kelco Water Engineering, Inc. | Method and apparatus for recycling R/O waste water |
US5496466A (en) * | 1993-09-14 | 1996-03-05 | Teledyne Industries, Inc. | Portable water purification system with double piston pump |
US5403479A (en) * | 1993-12-20 | 1995-04-04 | Zenon Environmental Inc. | In situ cleaning system for fouled membranes |
US5501798A (en) * | 1994-04-06 | 1996-03-26 | Zenon Environmental, Inc. | Microfiltration enhanced reverse osmosis for water treatment |
AU2251495A (en) * | 1994-05-02 | 1995-11-29 | Master Flo Technology Inc. | Reverse osmosis filtration system |
JPH07313850A (en) * | 1994-05-30 | 1995-12-05 | Kubota Corp | Method for backward washing immersion-type ceramic membrane separator |
US5520816A (en) * | 1994-08-18 | 1996-05-28 | Kuepper; Theodore A. | Zero waste effluent desalination system |
US5676824A (en) * | 1994-09-30 | 1997-10-14 | Samsung Electronics Co., Ltd. | Water purifier with means for indicating when filter replacement is due and for automatically initiating a membrane washing step |
US5585531A (en) * | 1994-10-07 | 1996-12-17 | Barker; Tracy A. | Method for processing liquid radioactive waste |
US5632892A (en) * | 1995-10-19 | 1997-05-27 | Mechanical Equipment Company, Inc. | Portable reverse osmosis water purification plant |
US5685980A (en) * | 1996-03-07 | 1997-11-11 | Patapoff; Walter | Miniaturized handheld desalination field unit |
-
1998
- 1998-02-09 US US09/020,726 patent/US6120688A/en not_active Expired - Lifetime
- 1998-02-23 PL PL335404A patent/PL190786B1/en not_active IP Right Cessation
- 1998-02-23 AU AU62024/98A patent/AU743993B2/en not_active Ceased
- 1998-02-23 WO PCT/CA1998/000130 patent/WO1998037950A1/en active IP Right Grant
- 1998-02-23 DE DE69829952T patent/DE69829952T2/en not_active Expired - Fee Related
- 1998-02-23 HU HU0000639A patent/HU222408B1/en active IP Right Grant
- 1998-02-23 CA CA002281889A patent/CA2281889C/en not_active Expired - Lifetime
- 1998-02-23 EP EP98903967A patent/EP0966319B1/en not_active Expired - Lifetime
- 1998-02-24 TW TW087102664A patent/TW409070B/en not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56111006A (en) * | 1980-02-07 | 1981-09-02 | Ebara Infilco Co Ltd | Method for utilization of back pressure in membrane separating process |
US5059317A (en) * | 1989-10-02 | 1991-10-22 | Dietrich Marius | Transportable apparatus for producing drinking water |
US5248424A (en) * | 1990-08-17 | 1993-09-28 | Zenon Environmental Inc. | Frameless array of hollow fiber membranes and method of maintaining clean fiber surfaces while filtering a substrate to withdraw a permeate |
JPH04305287A (en) * | 1991-04-01 | 1992-10-28 | Kubota Corp | Water treating equipment |
JPH05212252A (en) * | 1992-02-04 | 1993-08-24 | Toray Ind Inc | Reverse-osmosis liquid separator |
US5244579A (en) * | 1992-10-09 | 1993-09-14 | Zenon Environmental Inc. | Transportable reverse osmosis water purification unit |
DE19520913A1 (en) * | 1995-06-08 | 1996-12-12 | Schael Wilfried | Method and device for water treatment according to the principle of reverse osmosis |
JPH09174094A (en) * | 1995-12-26 | 1997-07-08 | Mitsubishi Rayon Eng Co Ltd | Raw water treatment method |
Non-Patent Citations (8)
Title |
---|
DATABASE WPI Section Ch Week 8908, Derwent World Patents Index; Class J01, AN 89-059261 * |
DATABASE WPI Section Ch Week 9250, Derwent World Patents Index; Class D15, AN 92-409965 * |
DATABASE WPI Section Ch Week 9338, Derwent World Patents Index; Class A88, AN 93-299024 * |
DATABASE WPI Section Ch Week 9824, Derwent World Patents Index; Class D15, AN 98-264422 * |
PATENT ABSTRACTS OF JAPAN vol. 005, no. 188 (C - 081) 27 November 1981 (1981-11-27) * |
PATENT ABSTRACTS OF JAPAN vol. 017, no. 131 (C - 1036) 18 March 1993 (1993-03-18) * |
PATENT ABSTRACTS OF JAPAN vol. 017, no. 659 (C - 1137) 7 December 1993 (1993-12-07) * |
PATENT ABSTRACTS OF JAPAN vol. 097, no. 011 28 November 1997 (1997-11-28) * |
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US6627082B2 (en) | 1999-06-10 | 2003-09-30 | Envirogen, Inc. | System and method for withdrawing permeate through a filter and for cleaning the filter in situ |
US6878282B2 (en) | 1999-06-10 | 2005-04-12 | Envirogen, Inc. | System and method for withdrawing permeate through a filter and for cleaning the filter in situ |
DE10000874A1 (en) * | 2000-01-12 | 2001-07-19 | Klaus Brinkmann | Emergency cross-flow water filter is contained within portable case and electrically powered by solar cells or wind generator |
EP1323461A2 (en) * | 2001-12-17 | 2003-07-02 | Nitto Denko Corporation | Treatment system having spiral membrane element and method for operating the treatment system |
EP1323461A3 (en) * | 2001-12-17 | 2006-07-26 | Nitto Denko Corporation | Treatment system having spiral membrane element and method for operating the treatment system |
WO2010137787A1 (en) | 2009-05-28 | 2010-12-02 | Woongjin Coway Co., Ltd. | Washing device for water treatment apparatus and washing method thereof |
EP2435157A1 (en) * | 2009-05-28 | 2012-04-04 | Woongjin Coway Co., Ltd. | Washing device for water treatment apparatus and washing method thereof |
EP2435157A4 (en) * | 2009-05-28 | 2013-07-24 | Woongjin Coway Co Ltd | Washing device for water treatment apparatus and washing method thereof |
US9139451B2 (en) | 2009-05-28 | 2015-09-22 | Woongjin Coway Co., Ltd | Washing device for water treatment apparatus and washing method thereof |
US9604264B2 (en) | 2009-05-28 | 2017-03-28 | Woongjin Coway Co., Ltd | Washing device for water treatment apparatus and washing method thereof |
US9908159B2 (en) | 2009-05-28 | 2018-03-06 | Woongjin Coway Co., Ltd | Washing device for water treatment apparatus and washing method thereof |
Also Published As
Publication number | Publication date |
---|---|
PL190786B1 (en) | 2006-01-31 |
DE69829952D1 (en) | 2005-06-02 |
HU222408B1 (en) | 2003-06-28 |
PL335404A1 (en) | 2000-04-25 |
AU743993B2 (en) | 2002-02-14 |
HUP0000639A3 (en) | 2000-07-28 |
TW409070B (en) | 2000-10-21 |
CA2281889A1 (en) | 1998-09-03 |
EP0966319B1 (en) | 2005-04-27 |
HUP0000639A2 (en) | 2000-06-28 |
US6120688A (en) | 2000-09-19 |
AU6202498A (en) | 1998-09-18 |
DE69829952T2 (en) | 2006-03-02 |
CA2281889C (en) | 2006-10-03 |
EP0966319A1 (en) | 1999-12-29 |
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